Electrode joining structure and biosensor

Abstract

An electrode joining structure includes: a pressure-sensitive adhesive layer having an affixing surface to be affixed to a test subject; an electrode containing a conductive polymer having elasticity, and configured to be exposed from the affixing surface of the pressure-sensitive adhesive layer; a base material layer provided to be overlaid on a surface opposite to the affixing surface of the pressure-sensitive adhesive layer, and having tackiness represented by a maximum diameter from among diameters of steel balls that stop in a ball rolling method called J. Dow ball tack, the maximum diameter being greater than or equal to 0.4 mm and less than or equal to 4 mm; a substrate provided on the base material layer; a wire provided on the substrate and connected to the electrode; and a joining part joining the electrode and the wire.

1 . An electrode joining structure, comprising:
 a pressure-sensitive adhesive layer having an affixing surface to be affixed to a test subject;   an electrode containing a conductive polymer having elasticity, and configured to be exposed from the affixing surface of the pressure-sensitive adhesive layer;   a base material layer provided to be overlaid on a surface opposite to the affixing surface of the pressure-sensitive adhesive layer, and having tackiness represented by a maximum diameter from among diameters of steel balls that stop in a ball rolling method called J. Dow ball tack, the maximum diameter being greater than or equal to 0.4 mm and less than or equal to 4 mm;   a substrate provided on the base material layer;   a wire provided on the substrate and connected to the electrode; and   a joining part joining the electrode and the wire.   
     
     
         2 . The electrode joining structure as claimed in  claim 1 , wherein the wire is provided on the substrate. 
     
     
         3 . The electrode joining structure as claimed in  claim 2 , wherein the wire is constituted with a plating layer produced by plating on the substrate. 
     
     
         4 . The electrode joining structure as claimed in  claim 1 , wherein stiffness of the substrate is higher than stiffness of the base material layer. 
     
     
         5 . A biosensor comprising:
 the electrode joining structure as claimed in  claim 1 ; and   an electronic device provided on the base material layer, and configured to process a biological signal obtained via the electrode.